Pinking attachment for sewing machines



Sept. 20, 1932. M. PoPPr-:R 1,878,293

PlNmNG ATTAQHMENTVFOR SEWING MACHINES Filed April 9. 1932 y. 3 EL- l2 /7'"30 'IN1/ENTOR. Y ,4 2 MAX PUPPE/Q.

Patented Sept. 20, 1932 PATEur- OFFICE- A MAX POIPPER, vOfl BROOKLYN, NEW-YORK PINKING ATTACHMEN'J.'u FOR SEWING MACHINES Application filed April 9, 1932. Serial No. 604,160.

This invention relates to a new and improved pinking attachment for sewing machines and 1s an improvement on my pinking attachment applicat-ion Serial Number 5 594,015, filed February 19, 1932. The main obj ect ofthe invention is to provide a pinking attachment which can be readily applied to any sewing machine and by means of which the edges of the fabric being sewed will at the same time be pinked and be given an ornamental appearance.

Another object of this invention is to provide a pinking attachment having a base rigidly attached to the base-plate of a sewing r: machine and having a cutter arm pivotally mounted on said pinking attachment base and linked to an eccentric actuated by the needlebar shaft and constrained to swing up and down, in a positive manner, solely due to the motion of the needle-bar shaft.

Another object of this invention is to provide means for disengaging the link from the pivotally mounted cutter arm and operate the sewing machine exclusively for stitching mains fixed to the base-plate of the sewing machine.

Another object of this invention is to provide a lifter arm acting against the pinking attachment base and against the under side of the pivotally mounted cutter arm and which operates to support the cutter arm in an elevated position and the cutting members out of cutting engagement when the link is disengaged from the pivotally mounted cutter arm.

Another object of this invention is to provide improved cutting members having cutting surfaces in inclined'relation with each other and producing a scissors action and a smooth clean cut on all kinds of fabrics and on fabrics of various thicknesses.

Another object of this invention is to mount the male cutting member in pivotal resure'between the Cutting edges of the male and purposes while the pinking attachment relation with the pivotally mounted cutter arm female cutting members thereby automatically compensating for wear taking place between the cutting surfaces.

With the above and other objects in view the invention will be hereinafter more particularly described, and the combination and arrangement of parts will be shown in the accompanying drawing and pointed out in the claims which form part of this specification.

Reference will now be had to the drawing, wherein like numerals of reference designate corresponding parts throughout the several views, in which:

Figure 1 is a side elevation of a portion of 65 a sewing machine equipped with my pinking attachment, the pinking attachment being partly in longitudinal section, the section beiing ,taken as on line 1 1 in Figure 2.

Figure 2 is a plan view of the pinking 70 attachment. K l

Figure 3 is a sectional view, on a reduced scale, the section being taken as on line 3--3 in Figure 1. i

In the illustrated embodiment of the in- 76 vention the numeral 10, indicates my pinking attachment, comprising a base 11, having upwardly extending arms 12, 12, at one end, designed to form guide means for a cutter arm 13, pivotaly mounted on a shaft 14, ex- 80 tending through. said arms.

As best shown in Figure 1, the cutter arm 13, has been provided at its lower end ladjacent the shaft 14, with an angularly extending arm 15, designed to enter a recess 16, in the base 11, and abut against an upper extension 17, of the base and thus limiting the upward movement of the cutter arm 13, to a predetermined4 maximum.

At the free end 18, of the cutter arm 13, there has been provided two arms 19, 19, designed to form guide means for a bar 20, pivotally mounted on a pin 21, extending through said arms.

A cutter carrying member 22, preferably triangular in form is fastened to the bar 20, by means of a bolt 23. A hardened sheet steel cutting member 32, of triangular form is fixedly mounted on the cutter carrying member 22, by means of screws 33, 33, and is pro- 10 vided with downwardly facing extensions 24, 24, constantly in .engagement with a female cutting member 25. fastened to the lower surface of the base 11, and having a triangular aperture 26, designed to receive the male cutting member 32. The bolt 23, also serves for raising and lowering the male cutting member 32, and adjusting it after being ground for wear. The extensions 24, 24, on the male cutting member 32, serve to maintain the male and female cutting members in alignment. T he lower edge 34, of the male cutting member 32, has been provided with an inwardly facing bevel 35, which extends upwardly and meets the lower edge 36, of the cutter carrying member 22.v

An adjusting screw 27, has been provided in the extension 17, of the base` 11, and can be screwed down against the angularly extending arm 15, and serves to adjust the upward movement of the cutter arm 13, so that the extensions 24, 24, of the' male cutting member 32, will remain in engagement with the female cutting member 25, under all operating conditions.

A ribbon-like multiple leaf spring 28, has been fastened to the cutter arm 13, by means of a screw 29, and extends angularly against the cutter carrying member 22, and serves to force said member outwardly about the pin 21, and forces the male cutting member 32,

into forced engagement with the female cutting member 25. A screw 47, has also been provided for adjusting the tension of the spring 28, and serves as means for regulating the frictional pressure required for cutting -fabrics of various thicknesses.

As best shown in Figure 1, there has been provided a housing 30, integral with the'base 11, and having a slot 31, for a lifter armv37, pivotally mounted on a pin 38, in the housing 30. As shown in Figure 3, the lifter arm 37, may be raised to react against the under side of the pivotally mounted cutter arm 13, and against the pinking attachment base 11, and

serves to support the cutter arm in an elevated position and the cutting members out of cutting engagement.

Figure 1, shows my pinking attachment 10, mounted on the base plate 39, of a sewing machine 40, and is rigidly attached thereto by means of a bolt 41, passing through an elongated aperture 42, in the base 11, of my attachment 10. It will be noted that the cloth plate 43, of the sewing machine 40, has been cutaway so as to provide two parallel longitudinal inner guide surfaces 44, 44, shown in dot and dash lines in Figure 2.V It will be noted that the width of the female cutting member 25, has been made equal to the spacing between the parallel guide surfaces 44, 44, and that by unscrewing the bolt 41, it is possible to slide the entire pinking attachment 10, longitudinally and thus vary the distance between the stitch line formed by the needle 45, and the ornamented edge formed by the pinking or cutting members 32, and 25.

It is also to be noted that the lower face 46, of the base 11, is in the same plane as the cloth plate 43, of the sewing machine 40, and that the female cutting member 25, is fas tened against the lower face of the base 11, and thus making it possible to grind and renew the working face of the female cutting member indefinitely as it always returns to the original level of the cloth plate after grinding. The importance of maintaining the female cutting member 25, and the cloth plate 43, in a constant level plane, as provided by the structure thus described, arises from the fact that if there were any irregularity in the operating surfaces of the feeding mechanism, the material operated on would not feed properly and this would interfere with the operator of the sewing machine.

As shown in Figures 2, and 3, the cutter arm 13, has been provided at its upper portion with a U-shaped recess 49, and a boss 50 having a through aperture 51, in central alignment with said recess. The aperture 51, has aV reduced end portion 52. An upright slot 53, has been provided at the far end of the boss 50, and terminates at the aperture 52. An open coil spring 54, and a stepped pin 55, have been inserted in the aperture 51. A pin 56, has been pressed into an aperture in the reduced portion of the stepped pin 55, and is normally in engagement with the slot 53. It will thus be noted that the pin 56, may be pulled towards the far` end of the boss and when disengaged from the slot 53, may be turned around approximately ninety degrees, to assume the position shown in Figure 3, when the pin 56, is held fast against the front face of the boss 50, and the stepped pin 55, is entirely within the aperture 51, instead of projecting into the recess 49, as shown in Figure 2.

Referring to Figures 1, and 3, it will be seen that the actuating mechanism for the cutter arm 13, of my pinkin attachment 10, comprises the needle-bar saft 57, of the sewing machine 40,A and a worm 58, xed thereon,- and which engages with a worm gear 59, carried by a transverse shaft 60. The shaft 60, has been provided with an eccentric end portion forming a bearing 62, on which there has been mounted a pendant link member 63, having an aperture-64, at its lower end. The aperture 64 .is designed to receive in engagement the enlarged end portion of the stepped pin 55. The link 3, engages with the recess 49. A flange 65,- olted against the ucutter arm 13, has been provided to maintain the link member in operating position in the recess 49.

It will thus be noted that when the step pin 55, is placed in engagement with the aperture 64, in the'link member 63, that the pivotally mounted cutter arm 13, will be constrained to swing up and down in a ositive manner, solely due to the motion of t e needle-bar shaft 57. i

' It will also be noted that when the step pin 55, is disengaged from the link member 63,'

that my pinking attachment 10, becomes-operatively dissociated from the sewing ma-y chine 40, and that the sewing machine may then be operated exclusively for stitching purposes. Under such conditions, the lifter arm 37, is raised and reacts against the under side of the cutter arm and supports the cutter arm in an elevated position and the cutting members out of cutting engagement.

It will thus be seen that I have provided a very simple pinking attachment by means of whichit is possible to convert any standard Vsewing machine into a combined stitching and pinking machine', which ornaments the edge of the fabric and prevents it fromunraveling. It is obvious that when mypinking attachment .is incorporated in a sewing machine, a large saving in time and labor is effected because the fabric may be stitched and pinked in one operation.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent:

1. In combination with a sewing machine having a shaft mounted below and transverse with the needle-bar shaft, said needle-bar shaft having a worm mounted thereon and being operatively associated with a worm gear mounted on said transverse shaft for driving said shaft, said transverse shaft having an eccentric end portion, a pendant link member having its upper end in engagement with said eccentric end portion, a pinkin at- A tachment having a base .mounted on the ase of said sewing machine and having a cutter arm pivotally mountedon said pinking attachment base, said cutter arm having means thereon for engagement with the lower end of said link member and being thereby constrained to swing up and -down solely due to the motion of said needle-bar shaft.

2. In combination with a sewing machine having a shaft mounted below and transverse with the needle-bar shaft, said needlebar shaft having a worm mounted thereon and being operatively associated with a worm gear mounted -on said transverse shaft for driving said shaft, said transverse shaft having` an eccentric end portion,` a pendant link member having its upper end in engagement with said eccentric end portion, a pinking attachment having a base mounted on the base of said sewing machine and having a cutter arm pivotally mounted on said pinking attachment base, means for connecting said cutter arm with the lower end of said link member .and causing said cutter arm to swing up and down solely due to the motion of said needle-bar shaft.

3. In combination with a sewing machine 4the with a worm gear mounted on said transverse shaft for driving said shaft, said transverse shaft having'an eccentric end portion, a pendant link member having its upper end in engagement with said -eccentric end portion, a pinking attachment having a base mounted on the base of said sewing machine and a female cutting member fastened to the lower surface of the pinking attachmentbase and being level with the said cloth plate, said pinking attachment having an arm for supporting a male cutting member pivotally mounted on said pinking attachment base, means for connectinggsaid cutter arm with the loweriend of said link member and causing said cutter arm to swing up and' down solely due to the motion of said needle-bar shaft, and a lifter arm for supporting the cutter arm in an elevated position and the cutting members out of cutting engagement when the link is disconnected from the pivotally mounted cutter arm.

4. In combination Witha sewing machine having a shaft mounted transverse with needle-bar shaft, said needle-bar shaft having gear means mounted 'thereon and being intermeshed with gear means mounted on said transverse shaft for driving said shaft, said transverse shaft having an eccentric portion, a link member having its upper end .in engagement with said eccentric portion of the transverse shaft, a pinking attachment having a base mounted on the base of said sewing machine and having a cutter arm pivotaly mounted on said pinking attachment base, said cutter arm having means thereon for engagement with the lower end of said link member and being thereby constrained to swing up and down solely due to the motion of said needle-bar shaft.

Signed at New York, in the county of New York and State of New York this 8th day of 

